New-AzureRmVm: Avaialibility Set should be also created in simplified parameter set?

### Description

Proposed parameters:
```C#
new AvailabilitySet
{
Sku = new Azure.Management.Compute.Models.Sku { Name = "Aligned" },
PlatformFaultDomainCount = 2,
PlatformUpdateDomainCount = 2,
}
```

We need to understand scenarios and how easy to change and how expensive it.

### Script/Steps for Reproduction

```powershell

```

### Module Version

```powershell
Get-Module -Name AzureRM -ListAvailable
```

### Environment Data

```powershell
$PSVersionTable
```

### Debug Output

```

```